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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ByteUtil.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Converter;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Comparator;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>/**<a name="line.14"></a>
<span class="sourceLineNo">015</span> * Byte manipulation utilities.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>public final class ByteUtil {<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>    /**<a name="line.19"></a>
<span class="sourceLineNo">020</span>     * An empty byte array. This is the minimum value according to {@link #COMPARATOR}.<a name="line.20"></a>
<span class="sourceLineNo">021</span>     */<a name="line.21"></a>
<span class="sourceLineNo">022</span>    public static final byte[] EMPTY = new byte[0];<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    /**<a name="line.24"></a>
<span class="sourceLineNo">025</span>     * {@link Comparator} that compares two byte arrays lexicographically using unsigned values.<a name="line.25"></a>
<span class="sourceLineNo">026</span>     */<a name="line.26"></a>
<span class="sourceLineNo">027</span>    public static final Comparator&lt;byte[]&gt; COMPARATOR = new Comparator&lt;byte[]&gt;() {<a name="line.27"></a>
<span class="sourceLineNo">028</span>        @Override<a name="line.28"></a>
<span class="sourceLineNo">029</span>        public int compare(byte[] b1, byte[] b2) {<a name="line.29"></a>
<span class="sourceLineNo">030</span>            return ByteUtil.compare(b1, b2);<a name="line.30"></a>
<span class="sourceLineNo">031</span>        }<a name="line.31"></a>
<span class="sourceLineNo">032</span>    };<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>    /**<a name="line.34"></a>
<span class="sourceLineNo">035</span>     * A {@link Converter} that converts between {@code byte[]} arrays and hexadecimal {@link String}s.<a name="line.35"></a>
<span class="sourceLineNo">036</span>     */<a name="line.36"></a>
<span class="sourceLineNo">037</span>    public static final Converter&lt;byte[], String&gt; STRING_CONVERTER = new Converter&lt;byte[], String&gt;() {<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>        @Override<a name="line.39"></a>
<span class="sourceLineNo">040</span>        public String doForward(byte[] b) {<a name="line.40"></a>
<span class="sourceLineNo">041</span>            return b != null ? ByteUtil.toString(b) : null;<a name="line.41"></a>
<span class="sourceLineNo">042</span>        }<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>        @Override<a name="line.44"></a>
<span class="sourceLineNo">045</span>        public byte[] doBackward(String s) {<a name="line.45"></a>
<span class="sourceLineNo">046</span>            return s != null ? ByteUtil.parse(s) : null;<a name="line.46"></a>
<span class="sourceLineNo">047</span>        }<a name="line.47"></a>
<span class="sourceLineNo">048</span>    };<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    private ByteUtil() {<a name="line.50"></a>
<span class="sourceLineNo">051</span>    }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>    /**<a name="line.53"></a>
<span class="sourceLineNo">054</span>     * Compare two byte arrays lexicographically using unsigned values.<a name="line.54"></a>
<span class="sourceLineNo">055</span>     *<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * @param b1 first byte array<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * @param b2 second byte array<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * @return -1 if {@code b1 &lt; b2}, 1 if {@code b1 &gt; b2}, or zero if {@code b1 = b2}<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @throws NullPointerException if {@code b1} or {@code b2} is null<a name="line.59"></a>
<span class="sourceLineNo">060</span>     */<a name="line.60"></a>
<span class="sourceLineNo">061</span>    public static int compare(byte[] b1, byte[] b2) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        if (b1 == b2)<a name="line.62"></a>
<span class="sourceLineNo">063</span>            return 0;<a name="line.63"></a>
<span class="sourceLineNo">064</span>        final int sharedLength = Math.min(b1.length, b2.length);<a name="line.64"></a>
<span class="sourceLineNo">065</span>        for (int i = 0; i &lt; sharedLength; i++) {<a name="line.65"></a>
<span class="sourceLineNo">066</span>            final int v1 = b1[i] &amp; 0xff;<a name="line.66"></a>
<span class="sourceLineNo">067</span>            final int v2 = b2[i] &amp; 0xff;<a name="line.67"></a>
<span class="sourceLineNo">068</span>            if (v1 &lt; v2)<a name="line.68"></a>
<span class="sourceLineNo">069</span>                return -1;<a name="line.69"></a>
<span class="sourceLineNo">070</span>            if (v1 &gt; v2)<a name="line.70"></a>
<span class="sourceLineNo">071</span>                return 1;<a name="line.71"></a>
<span class="sourceLineNo">072</span>        }<a name="line.72"></a>
<span class="sourceLineNo">073</span>        if (b1.length &lt; b2.length)<a name="line.73"></a>
<span class="sourceLineNo">074</span>            return -1;<a name="line.74"></a>
<span class="sourceLineNo">075</span>        if (b1.length &gt; b2.length)<a name="line.75"></a>
<span class="sourceLineNo">076</span>            return 1;<a name="line.76"></a>
<span class="sourceLineNo">077</span>        return 0;<a name="line.77"></a>
<span class="sourceLineNo">078</span>    }<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>    /**<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * Determine the smaller of two byte arrays when compared lexicographically using unsigned values.<a name="line.81"></a>
<span class="sourceLineNo">082</span>     *<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * @param b1 first byte array<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * @param b2 second byte array<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * @return {@code b1} if {@code b1 &lt;= b2}, otherwise {@code b2}<a name="line.85"></a>
<span class="sourceLineNo">086</span>     * @throws NullPointerException if {@code b1} or {@code b2} is null<a name="line.86"></a>
<span class="sourceLineNo">087</span>     */<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public static byte[] min(byte[] b1, byte[] b2) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        return ByteUtil.compare(b1, b2) &lt;= 0 ? b1 : b2;<a name="line.89"></a>
<span class="sourceLineNo">090</span>    }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>    /**<a name="line.92"></a>
<span class="sourceLineNo">093</span>     * Determine the larger of two byte arrays when compared lexicographically using unsigned values.<a name="line.93"></a>
<span class="sourceLineNo">094</span>     *<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * @param b1 first byte array<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * @param b2 second byte array<a name="line.96"></a>
<span class="sourceLineNo">097</span>     * @return {@code b1} if {@code b1 &gt;= b2}, otherwise {@code b2}<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * @throws NullPointerException if {@code b1} or {@code b2} is null<a name="line.98"></a>
<span class="sourceLineNo">099</span>     */<a name="line.99"></a>
<span class="sourceLineNo">100</span>    public static byte[] max(byte[] b1, byte[] b2) {<a name="line.100"></a>
<span class="sourceLineNo">101</span>        return ByteUtil.compare(b1, b2) &gt;= 0 ? b1 : b2;<a name="line.101"></a>
<span class="sourceLineNo">102</span>    }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>    /**<a name="line.104"></a>
<span class="sourceLineNo">105</span>     * Determine if the first of two {@code byte[]} arrays is a prefix of the second.<a name="line.105"></a>
<span class="sourceLineNo">106</span>     *<a name="line.106"></a>
<span class="sourceLineNo">107</span>     * @param prefix prefix to check<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * @param value value to check for having {@code prefix} as a prefix<a name="line.108"></a>
<span class="sourceLineNo">109</span>     * @return true if {@code prefix} is a prefix of {@code value}<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * @throws NullPointerException if {@code prefix} or {@code value} is null<a name="line.110"></a>
<span class="sourceLineNo">111</span>     */<a name="line.111"></a>
<span class="sourceLineNo">112</span>    public static boolean isPrefixOf(byte[] prefix, byte[] value) {<a name="line.112"></a>
<span class="sourceLineNo">113</span>        if (prefix.length &gt; value.length)<a name="line.113"></a>
<span class="sourceLineNo">114</span>            return false;<a name="line.114"></a>
<span class="sourceLineNo">115</span>        for (int i = 0; i &lt; prefix.length; i++) {<a name="line.115"></a>
<span class="sourceLineNo">116</span>            if (value[i] != prefix[i])<a name="line.116"></a>
<span class="sourceLineNo">117</span>                return false;<a name="line.117"></a>
<span class="sourceLineNo">118</span>        }<a name="line.118"></a>
<span class="sourceLineNo">119</span>        return true;<a name="line.119"></a>
<span class="sourceLineNo">120</span>    }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span>    /**<a name="line.122"></a>
<span class="sourceLineNo">123</span>     * Get the next key greater than the given key in unsigned lexicographic ordering.<a name="line.123"></a>
<span class="sourceLineNo">124</span>     * This creates a new key simply by appending a {@code 0x00} byte to the data<a name="line.124"></a>
<span class="sourceLineNo">125</span>     * contained in the given key.<a name="line.125"></a>
<span class="sourceLineNo">126</span>     *<a name="line.126"></a>
<span class="sourceLineNo">127</span>     * @param key previous key<a name="line.127"></a>
<span class="sourceLineNo">128</span>     * @return next key after {@code key}<a name="line.128"></a>
<span class="sourceLineNo">129</span>     * @throws NullPointerException if {@code key} is null<a name="line.129"></a>
<span class="sourceLineNo">130</span>     */<a name="line.130"></a>
<span class="sourceLineNo">131</span>    public static byte[] getNextKey(byte[] key) {<a name="line.131"></a>
<span class="sourceLineNo">132</span>        final byte[] nextKey = new byte[key.length + 1];<a name="line.132"></a>
<span class="sourceLineNo">133</span>        System.arraycopy(key, 0, nextKey, 0, key.length);<a name="line.133"></a>
<span class="sourceLineNo">134</span>        return nextKey;<a name="line.134"></a>
<span class="sourceLineNo">135</span>    }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>    /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>     * Get the first key that would be greater than the given key in unsigned lexicographic<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * ordering &lt;i&gt;and&lt;/i&gt; that does not have the given key as a prefix.<a name="line.139"></a>
<span class="sourceLineNo">140</span>     *<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * @param prefix lower bound prefix key<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * @return next key not having {@code prefix} as a prefix<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * @throws IllegalArgumentException if {@code prefix} has zero length<a name="line.143"></a>
<span class="sourceLineNo">144</span>     * @throws IllegalArgumentException if {@code prefix} contains only {@code 0xff} bytes<a name="line.144"></a>
<span class="sourceLineNo">145</span>     * @throws NullPointerException if {@code prefix} is null<a name="line.145"></a>
<span class="sourceLineNo">146</span>     */<a name="line.146"></a>
<span class="sourceLineNo">147</span>    public static byte[] getKeyAfterPrefix(byte[] prefix) {<a name="line.147"></a>
<span class="sourceLineNo">148</span>        int len = prefix.length;<a name="line.148"></a>
<span class="sourceLineNo">149</span>        if (len == 0)<a name="line.149"></a>
<span class="sourceLineNo">150</span>            throw new IllegalArgumentException("empty prefix");<a name="line.150"></a>
<span class="sourceLineNo">151</span>        while (len &gt; 0 &amp;&amp; prefix[len - 1] == (byte)0xff)<a name="line.151"></a>
<span class="sourceLineNo">152</span>            len--;<a name="line.152"></a>
<span class="sourceLineNo">153</span>        if (len &lt;= 0)<a name="line.153"></a>
<span class="sourceLineNo">154</span>            throw new IllegalArgumentException("prefix contains only 0xff bytes");<a name="line.154"></a>
<span class="sourceLineNo">155</span>        final byte[] buf = new byte[len];<a name="line.155"></a>
<span class="sourceLineNo">156</span>        System.arraycopy(prefix, 0, buf, 0, len);<a name="line.156"></a>
<span class="sourceLineNo">157</span>        buf[len - 1]++;<a name="line.157"></a>
<span class="sourceLineNo">158</span>        return buf;<a name="line.158"></a>
<span class="sourceLineNo">159</span>    }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span>    /**<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * Convert a byte array into a string of hex digits, or {@code "null"} if {@code buf} is null.<a name="line.162"></a>
<span class="sourceLineNo">163</span>     *<a name="line.163"></a>
<span class="sourceLineNo">164</span>     * @param buf bytes<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * @return string encoding of {@code buf}<a name="line.165"></a>
<span class="sourceLineNo">166</span>     * @see #parse parse()<a name="line.166"></a>
<span class="sourceLineNo">167</span>     */<a name="line.167"></a>
<span class="sourceLineNo">168</span>    public static String toString(byte[] buf) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>        if (buf == null)<a name="line.169"></a>
<span class="sourceLineNo">170</span>            return "null";<a name="line.170"></a>
<span class="sourceLineNo">171</span>        final char[] result = new char[buf.length * 2];<a name="line.171"></a>
<span class="sourceLineNo">172</span>        int off = 0;<a name="line.172"></a>
<span class="sourceLineNo">173</span>        for (int i = 0; i &lt; buf.length; i++) {<a name="line.173"></a>
<span class="sourceLineNo">174</span>            int value = buf[i];<a name="line.174"></a>
<span class="sourceLineNo">175</span>            result[off++] = Character.forDigit((value &gt;&gt; 4) &amp; 0x0f, 16);<a name="line.175"></a>
<span class="sourceLineNo">176</span>            result[off++] = Character.forDigit(value &amp; 0x0f, 16);<a name="line.176"></a>
<span class="sourceLineNo">177</span>        }<a name="line.177"></a>
<span class="sourceLineNo">178</span>        return new String(result);<a name="line.178"></a>
<span class="sourceLineNo">179</span>    }<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
<span class="sourceLineNo">181</span>    /**<a name="line.181"></a>
<span class="sourceLineNo">182</span>     * Decode a hexadecimal {@link String} into a {@code byte[]} array. The string must have an even<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * number of digits and contain no other characters (e.g., whitespace).<a name="line.183"></a>
<span class="sourceLineNo">184</span>     *<a name="line.184"></a>
<span class="sourceLineNo">185</span>     * @param text string previously encoded by {@link #toString(byte[])}<a name="line.185"></a>
<span class="sourceLineNo">186</span>     * @return {@code byte[]} decoding of {@code text}<a name="line.186"></a>
<span class="sourceLineNo">187</span>     * @throws IllegalArgumentException if any non-hexadecimal characters are found or the number of characters is odd<a name="line.187"></a>
<span class="sourceLineNo">188</span>     * @throws NullPointerException if {@code text} is null<a name="line.188"></a>
<span class="sourceLineNo">189</span>     * @see #toString(byte[]) toString()<a name="line.189"></a>
<span class="sourceLineNo">190</span>     */<a name="line.190"></a>
<span class="sourceLineNo">191</span>    public static byte[] parse(String text) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>        if ((text.length() &amp; 1) != 0)<a name="line.192"></a>
<span class="sourceLineNo">193</span>            throw new IllegalArgumentException("byte array has an odd number of digits");<a name="line.193"></a>
<span class="sourceLineNo">194</span>        final byte[] array = new byte[text.length() / 2];<a name="line.194"></a>
<span class="sourceLineNo">195</span>        int pos = 0;<a name="line.195"></a>
<span class="sourceLineNo">196</span>        for (int i = 0; pos &lt; text.length(); i++) {<a name="line.196"></a>
<span class="sourceLineNo">197</span>            final int nib1 = Character.digit(text.charAt(pos++), 16);<a name="line.197"></a>
<span class="sourceLineNo">198</span>            if (nib1 == -1)<a name="line.198"></a>
<span class="sourceLineNo">199</span>                throw new IllegalArgumentException("invalid hex digit `" + text.charAt(pos - 1) + "'");<a name="line.199"></a>
<span class="sourceLineNo">200</span>            final int nib2 = Character.digit(text.charAt(pos++), 16);<a name="line.200"></a>
<span class="sourceLineNo">201</span>            if (nib2 == -1)<a name="line.201"></a>
<span class="sourceLineNo">202</span>                throw new IllegalArgumentException("invalid hex digit `" + text.charAt(pos - 1) + "'");<a name="line.202"></a>
<span class="sourceLineNo">203</span>            array[i] = (byte)((nib1 &lt;&lt; 4) | nib2);<a name="line.203"></a>
<span class="sourceLineNo">204</span>        }<a name="line.204"></a>
<span class="sourceLineNo">205</span>        return array;<a name="line.205"></a>
<span class="sourceLineNo">206</span>    }<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>    /**<a name="line.208"></a>
<span class="sourceLineNo">209</span>     * Read an {@code int} as four big-endian bytes.<a name="line.209"></a>
<span class="sourceLineNo">210</span>     *<a name="line.210"></a>
<span class="sourceLineNo">211</span>     * @param reader input<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * @return decoded integer<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * @throws IndexOutOfBoundsException if less than four bytes remain in {@code reader}<a name="line.213"></a>
<span class="sourceLineNo">214</span>     * @throws NullPointerException if {@code reader} is null<a name="line.214"></a>
<span class="sourceLineNo">215</span>     * @see #writeInt writeInt()<a name="line.215"></a>
<span class="sourceLineNo">216</span>     */<a name="line.216"></a>
<span class="sourceLineNo">217</span>    public static int readInt(ByteReader reader) {<a name="line.217"></a>
<span class="sourceLineNo">218</span>        return (reader.readByte() &lt;&lt; 24) | (reader.readByte() &lt;&lt; 16) | (reader.readByte() &lt;&lt; 8) | reader.readByte();<a name="line.218"></a>
<span class="sourceLineNo">219</span>    }<a name="line.219"></a>
<span class="sourceLineNo">220</span><a name="line.220"></a>
<span class="sourceLineNo">221</span>    /**<a name="line.221"></a>
<span class="sourceLineNo">222</span>     * Write an {@code int} as four big-endian bytes.<a name="line.222"></a>
<span class="sourceLineNo">223</span>     *<a name="line.223"></a>
<span class="sourceLineNo">224</span>     * @param writer byte destination<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * @param value value to write<a name="line.225"></a>
<span class="sourceLineNo">226</span>     * @see #readInt readInt()<a name="line.226"></a>
<span class="sourceLineNo">227</span>     * @throws NullPointerException if {@code writer} is null<a name="line.227"></a>
<span class="sourceLineNo">228</span>     */<a name="line.228"></a>
<span class="sourceLineNo">229</span>    public static void writeInt(ByteWriter writer, int value) {<a name="line.229"></a>
<span class="sourceLineNo">230</span>        writer.writeByte(value &gt;&gt; 24);<a name="line.230"></a>
<span class="sourceLineNo">231</span>        writer.writeByte(value &gt;&gt; 16);<a name="line.231"></a>
<span class="sourceLineNo">232</span>        writer.writeByte(value &gt;&gt; 8);<a name="line.232"></a>
<span class="sourceLineNo">233</span>        writer.writeByte(value);<a name="line.233"></a>
<span class="sourceLineNo">234</span>    }<a name="line.234"></a>
<span class="sourceLineNo">235</span><a name="line.235"></a>
<span class="sourceLineNo">236</span>    /**<a name="line.236"></a>
<span class="sourceLineNo">237</span>     * Read a {@code long} as eight big-endian bytes.<a name="line.237"></a>
<span class="sourceLineNo">238</span>     *<a name="line.238"></a>
<span class="sourceLineNo">239</span>     * @param reader input<a name="line.239"></a>
<span class="sourceLineNo">240</span>     * @return decoded long<a name="line.240"></a>
<span class="sourceLineNo">241</span>     * @throws IndexOutOfBoundsException if less than eight bytes remain in {@code reader}<a name="line.241"></a>
<span class="sourceLineNo">242</span>     * @see #writeLong writeLong()<a name="line.242"></a>
<span class="sourceLineNo">243</span>     */<a name="line.243"></a>
<span class="sourceLineNo">244</span>    public static long readLong(ByteReader reader) {<a name="line.244"></a>
<span class="sourceLineNo">245</span>        return<a name="line.245"></a>
<span class="sourceLineNo">246</span>            ((long)reader.readByte() &lt;&lt; 56) | ((long)reader.readByte() &lt;&lt; 48)<a name="line.246"></a>
<span class="sourceLineNo">247</span>          | ((long)reader.readByte() &lt;&lt; 40) | ((long)reader.readByte() &lt;&lt; 32)<a name="line.247"></a>
<span class="sourceLineNo">248</span>          | ((long)reader.readByte() &lt;&lt; 24) | ((long)reader.readByte() &lt;&lt; 16)<a name="line.248"></a>
<span class="sourceLineNo">249</span>          | ((long)reader.readByte() &lt;&lt;  8) |  (long)reader.readByte();<a name="line.249"></a>
<span class="sourceLineNo">250</span>    }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span>    /**<a name="line.252"></a>
<span class="sourceLineNo">253</span>     * Write a {@code long} as eight big-endian bytes.<a name="line.253"></a>
<span class="sourceLineNo">254</span>     *<a name="line.254"></a>
<span class="sourceLineNo">255</span>     * @param writer byte destination<a name="line.255"></a>
<span class="sourceLineNo">256</span>     * @param value value to write<a name="line.256"></a>
<span class="sourceLineNo">257</span>     * @see #readLong readLong()<a name="line.257"></a>
<span class="sourceLineNo">258</span>     * @throws NullPointerException if {@code writer} is null<a name="line.258"></a>
<span class="sourceLineNo">259</span>     */<a name="line.259"></a>
<span class="sourceLineNo">260</span>    public static void writeLong(ByteWriter writer, long value) {<a name="line.260"></a>
<span class="sourceLineNo">261</span>        writer.writeByte((int)(value &gt;&gt; 56));<a name="line.261"></a>
<span class="sourceLineNo">262</span>        writer.writeByte((int)(value &gt;&gt; 48));<a name="line.262"></a>
<span class="sourceLineNo">263</span>        writer.writeByte((int)(value &gt;&gt; 40));<a name="line.263"></a>
<span class="sourceLineNo">264</span>        writer.writeByte((int)(value &gt;&gt; 32));<a name="line.264"></a>
<span class="sourceLineNo">265</span>        writer.writeByte((int)(value &gt;&gt; 24));<a name="line.265"></a>
<span class="sourceLineNo">266</span>        writer.writeByte((int)(value &gt;&gt; 16));<a name="line.266"></a>
<span class="sourceLineNo">267</span>        writer.writeByte((int)(value &gt;&gt; 8));<a name="line.267"></a>
<span class="sourceLineNo">268</span>        writer.writeByte((int)value);<a name="line.268"></a>
<span class="sourceLineNo">269</span>    }<a name="line.269"></a>
<span class="sourceLineNo">270</span>}<a name="line.270"></a>
<span class="sourceLineNo">271</span><a name="line.271"></a>




























































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